package com.hmdp.service.impl;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.bean.copier.CopyOptions;
import cn.hutool.core.lang.UUID;
import cn.hutool.core.util.RandomUtil;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.hmdp.dto.LoginFormDTO;
import com.hmdp.dto.Result;
import com.hmdp.dto.UserDTO;
import com.hmdp.entity.User;
import com.hmdp.mapper.UserMapper;
import com.hmdp.service.IUserService;
import com.hmdp.utils.RegexUtils;
import lombok.RequiredArgsConstructor;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Service;

import javax.servlet.http.HttpSession;
import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.TimeUnit;

import static com.hmdp.utils.RedisConstants.*;

/**
 * <p>
 * 服务实现类
 * </p>
 *
 * @author 虎哥
 * @since 2021-12-22
 */
@Slf4j
@Service
@RequiredArgsConstructor
public class UserServiceImpl extends ServiceImpl<UserMapper, User> implements IUserService {


    private final StringRedisTemplate stringRedisTemplate;

    /**
     * 发送验证码
     * @param phone 手机号
     * @param session
     * @return
     */
    @Override
    public Result sendCode(String phone, HttpSession session) {
        //1.校验手机号
        if (RegexUtils.isPhoneInvalid(phone)) {
            //2.不符合返回错误信息
            return Result.fail("手机号格式错误");
        }
        //3.符合，生成验证码
        String code = RandomUtil.randomNumbers(6);
        //4.保存验证码到redis
        stringRedisTemplate.opsForValue().set(LOGIN_CODE_KEY + phone, code,LOGIN_CODE_TTL, TimeUnit.MINUTES);
        //5.发送验证码
        log.debug("发送短信验证码成功，验证码：{}", code);
        return Result.ok();
    }

    /**
     * 登录功能
     * @param loginForm 登录参数，包含手机号、验证码；或者手机号、密码
     * @return 登录结果
     */
    @Override
    public Result login(LoginFormDTO loginForm, HttpSession session) {
        //1.校验手机号
        String phone = loginForm.getPhone();
        if (RegexUtils.isPhoneInvalid(phone)) {
            //1.2.不符合返回错误信息
            return Result.fail("手机号格式错误");
        }
        //2.校验验证码
        String cacheCode = stringRedisTemplate.opsForValue().get(LOGIN_CODE_KEY + phone);
        String code = loginForm.getCode();
        //3.不一致，返回错误信息
        if (cacheCode == null || !cacheCode.equals(code)) {
            //3.2.不一致，返回错误信息
            return Result.fail("验证码错误");
        }
        //4.一致，查询用户
        User user = query().eq("phone", loginForm.getPhone()).one();
        //5.用户不存在，创建新用户并保存
        if (user == null) {
            user = new User();
            user.setPhone(loginForm.getPhone());
            user.setNickName("user_" + RandomUtil.randomString(10));
            //保存用户
            save(user);
        }
        //6.存在，保存用户信息到redis，并返回ok
        UserDTO userDTO = BeanUtil.copyProperties(user, UserDTO.class);
        //6.1.随机生成token，作为登录令牌
        String token = UUID.randomUUID().toString(true);
        //6.2将user对象转为hash存储
        Map<String, Object> userMap = BeanUtil.beanToMap(userDTO,  new HashMap<>(),
                CopyOptions.create().setIgnoreNullValue(true).setFieldValueEditor((s, o) -> o.toString()));
        stringRedisTemplate.opsForHash().putAll(LOGIN_USER_KEY + token, userMap);
        //6.3.设置token有效期
        stringRedisTemplate.expire(LOGIN_USER_KEY + token, LOGIN_USER_TTL, TimeUnit.MINUTES);
        //6.4.返回token
        return Result.ok(token);
    }
}
